indentation vs serration

indentation

noun
  • A notch or recess, in the margin or border of anything. 

  • The act of beginning a line or series of lines at a little distance within the flush line of the column or page, as in the common way of beginning the first line of a paragraph. 

  • The act of indenting or state of being indented. 

  • A measure of the distance from the flush line. 

  • A division unit of a piece of law distinguished by its indentation or by a dash. 

  • A recess or sharp depression in any surface. 

serration

noun
  • A set of teeth or notches. 

  • One of the teeth in a serrated or serrate edge. 

  • The state of being serrated. 

How often have the words indentation and serration occurred in a corpus of books? (source: Google Ngram Viewer )